/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/
/****************************************************************************
 * drivers/usbhost/usbhost_trace.c
 *
 *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <tinyara/config.h>

#include <sys/types.h>
#include <stdint.h>
#include <errno.h>
#include <debug.h>

#include <arch/irq.h>
#include <tinyara/usb/usbhost_trace.h>
#undef usbtrace

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/* Configuration ************************************************************/

#ifndef CONFIG_USBHOST_TRACE_NRECORDS
#define CONFIG_USBHOST_TRACE_NRECORDS 128
#endif

/****************************************************************************
 * Private Types
 ****************************************************************************/

/****************************************************************************
 * Private Function Prototypes
 ****************************************************************************/

/****************************************************************************
 * Private Data
 ****************************************************************************/

#ifdef CONFIG_USBHOST_TRACE
static uint32_t g_trace[CONFIG_USBHOST_TRACE_NRECORDS];
static volatile uint16_t g_head = 0;
static volatile uint16_t g_tail = 0;
static volatile bool g_disabled = false;
#endif

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Name: usbhost_trsyslog
 *
 * Description:
 *  Dump trace data to the syslog()
 *
 ****************************************************************************/

#ifdef CONFIG_USBHOST_TRACE
static int usbhost_trsyslog(uint32_t event, FAR void *arg)
{
	FAR const char *fmt;
	uint16_t id;

	/* Decode the trace data */

	id = TRACE_DECODE_NDX(event);

	/* Get the format associated with the trace.  Try the one argument format
	 * first.
	 */

	fmt = usbhost_trformat1(id);
	if (fmt) {
		/* Just print the data using syslog() */

		syslog(LOG_INFO, fmt, (unsigned int)TRACE_DECODE_U23(event));
	}

	/* No, then it must the the two argument format first. */

	else {
		fmt = usbhost_trformat2(id);
		DEBUGASSERT(fmt);
		if (fmt) {
			/* Just print the data using syslog() */

			syslog(LOG_INFO, fmt, (unsigned int)TRACE_DECODE_U7(event), (unsigned int)TRACE_DECODE_U16(event));
		}
	}

	return OK;
}
#endif							/* CONFIG_USBHOST_TRACE */

/****************************************************************************
 * Name: usbhost_trace_common
 *
 * Description:
 *  Record a USB event (tracing or USB debug must be enabled)
 *
 * Assumptions:
 *   May be called from an interrupt handler
 *
 ****************************************************************************/

#ifdef CONFIG_USBHOST_TRACE
void usbhost_trace_common(uint32_t event)
{
	irqstate_t flags;

	/* Check if tracing is enabled for this ID */

	flags = irqsave();
	if (!g_disabled) {
		/* Yes... save the new trace data at the head */

		g_trace[g_head] = event;

		/* Increment the head and (probably) the tail index */

		if (++g_head >= CONFIG_USBHOST_TRACE_NRECORDS) {
			g_head = 0;
		}

		if (g_head == g_tail) {
			if (++g_tail >= CONFIG_USBHOST_TRACE_NRECORDS) {
				g_tail = 0;
			}
		}
	}
	irqrestore(flags);
}
#endif							/* CONFIG_USBHOST_TRACE */

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: usbhost_trace1 and usbhost_trace2
 *
 * Description:
 *  Record a USB event (tracing or USB debug must be enabled)
 *
 * Assumptions:
 *   May be called from an interrupt handler
 *
 ****************************************************************************/

#if defined(CONFIG_USBHOST_TRACE) || \
	(defined(CONFIG_DEBUG) && defined(CONFIG_DEBUG_USB))

void usbhost_trace1(uint16_t id, uint32_t u23)
{
#ifdef CONFIG_USBHOST_TRACE
	usbhost_trace_common(TRACE_ENCODE1(id, u23));
#else
	FAR const char *fmt;

	/* Get the format associated with the trace */

	fmt = usbhost_trformat1(id);
	DEBUGASSERT(fmt);

	/* Just print the data using syslog() */

	syslog(LOG_INFO, fmt, (unsigned int)u23);
#endif
}

void usbhost_trace2(uint16_t id, uint8_t u7, uint16_t u16)
{
#ifdef CONFIG_USBHOST_TRACE
	usbhost_trace_common(TRACE_ENCODE2(id, u7, u16));
#else
	FAR const char *fmt;

	/* Get the format associated with the trace */

	fmt = usbhost_trformat2(id);
	DEBUGASSERT(fmt);

	/* Just print the data using syslog() */

	syslog(LOG_INFO, fmt, u7, u16);
#endif
}

#endif							/* CONFIG_USBHOST_TRACE || CONFIG_DEBUG && CONFIG_DEBUG_USB */

/****************************************************************************
 * Name: usbtrace_enumerate
 *
 * Description:
 *   Enumerate all buffer trace data (will temporarily disable tracing)
 *
 * Assumptions:
 *   NEVER called from an interrupt handler
 *
 ****************************************************************************/

#ifdef CONFIG_USBHOST_TRACE
int usbhost_trenumerate(usbhost_trcallback_t callback, FAR void *arg)
{
	uint16_t ndx;
	int ret = OK;

	/* Temporarily disable tracing to avoid conflicts */

	g_disabled = true;

	/* Visit every entry, starting with the tail */

	for (ndx = g_tail; ndx != g_head;) {
		/* Call the user provided callback */

		ret = callback(g_trace[ndx], arg);
		if (ret != OK) {
			/* Abort the enumeration */

			break;
		}

		/* Increment the index */

		if (++ndx >= CONFIG_USBHOST_TRACE_NRECORDS) {
			ndx = 0;
		}
	}

	/* Discard the trace data after it has been reported */

	g_tail = g_head;

	/* Restore tracing state */

	g_disabled = false;
	return ret;
}
#endif							/* CONFIG_USBHOST_TRACE */

/****************************************************************************
 * Name: usbhost_trdump
 *
 * Description:
 *   Used usbhost_trenumerate to dump all buffer trace data to syslog().
 *
 * Assumptions:
 *   NEVER called from an interrupt handler
 *
 ****************************************************************************/

#ifdef CONFIG_USBHOST_TRACE
int usbhost_trdump(void)
{
	return usbhost_trenumerate(usbhost_trsyslog, NULL);
}
#endif							/* CONFIG_USBHOST_TRACE */
